Rotary back-up post



March 15, 1927. 1,467

c. w. PERKINS ROTARY BAcK-uP'Pos'r 'Filed Aug. 11, 1925 uni-Til IIIHIJIIIL Patented Mar. 15, 1.927.

. estates w. rriitiiins, f firings, magenta, f r'ciiiiIffiK-i/r .i.

MILLER, or SULPHUR, LOUISIANA.

acme area-e1 This 1 invention relates to rotary back-up pasts fo'r weir-armin apartment, vnah as that described in Patent Number 1,487,588.

"baa-rai post at imptevaaesignover that in the above-mentioned patent and to'evercome the clifliculties' efic'iiinterdwith such a structure ,togetherwith the difliculties encoiiritei'ed withother structures defined in the art.

It has been found that in the prior art it is most difficult to provide a member supporting the tong member on the rotary table which may be easily brought into engagement with and disengaged from the tong member, and-which is strong, durable and efficient in operation, and the disengagement and engagement of these members requlres considerable manual labor. It has further been found very difficult to construct a device of this character other than by casting and without the use of springs. It is an object of this invention to overcome the aforesaid difliculties and to provide a device of this character which is more efiicient and is quicker in operation, which is positive in its holdings and is not subject to accidental disengagement, but which may be easily disengaged when it is desired to do so.

It is an object of this invention to provide a device which will accomplish this end which may be manufactured at a minimum cost. It has been found that devices which do fairly satisfactorily function are costly in manufacture and have weak points where strength is required, and that especially, springs are weak and break, which puts the tool out of commission for the time. It is an object of this invention to overcome these wcakfeatures and to provide ,a device which may be manufactured at substantially a half of the cost of previous devices which simulate its function.

It has been found that the body of these back-up post-s requires the greatest strength, and that it is difficult if not'impossible to make castings which. will withstand the stresses. It is an object of this invention to provide a device which may be made from forgings and which-will prevent the breakage which generally occurs at the lower end and to provide cast port-ions where the stress is not so great.

With the feregeing -and other "objects in new, I have invent d th deviceillastrated I p p 4 u p H in the accompanyingdrawings, in which 2 An objectof-this invention is to provide a p 1 proved post;

Figure 1 "is a side elevation-cf my imf'rigmee front elevation;

Figure '3" is amp plan.

Figwre 4 is albottoi'n pla'n. v Bike reference characters indicate like parts throughout the several views and in the specification, in which there is provided a forged tubular post 2, flattened at its upper end at 3 to provide a tongue 4, the tongue 4 being provided medially with an upstanding latch keeper 5 and being provided with an arcuate face 6 below the keeper 5 and an arcuate face 7 above the keeper 5, the keeper 5 adapted to I receive the hook 8 of a latch 9, the latch 9 being pivoted to a pin 10 and extending beyond the pin in an anvil 11, the anvil 11 being hardened at 12 upon its upper surface and being lighter than the latch 9, whereby the latch 9 will gravitate :upon its pivotal axisupon the pin 10 into engagement with the keeper 8, there being. provided around the pin l0, w hich is hardened, a hardened steel collar 18. Straddling the tongue 4 is a yoke 14, the yoke 14 being provided with an arcuate lower terminal 15 and being suitably bored at 16 to receive a hardened steel collar 17 internal of which is a hardened steel pin 18, the pin 18 passing through'the tongue 4 and pivotallymounting the yoke 14 thereto, the yoke 14 closing in at its upper end with a bridge 19, the bridge 19 carrying a web 20, which web 20 forms the lower face of a tong-receiving shoulder and also a ledge for protecting the latch mechanism heretofore described. The bridge 19 extends pivotally, medially and centrally of thepin 18 in a tong rest 21, being webbed at 22 and reinforced at 23 as a supporting means for the tong. I

In operation, the yoke is swung upon its pivotal axis 18 until the latch gravitates with its hook 8 engaging the keeper 5, whereby the tong support 21 is perfectly and rigidly positioned centrally of the post 2, and when it is desired to disengage the shoulder 21 from the tong, a rap with a hammer upon the face 12 ofthe anvil 11 quickly,

positively and easily disengages the latch and permits the yoke member to swing upon its pivotal axis 18 out of engagement with the tong.

Claims:

1. In combination, a post provided with an upper flattened terminal forming a tongue, at tong support provided with a pair of depending ears adapted to embrace the tongue and pivotally connected with the tongue, a latch member pivotally connected to the tong support and provided with 'an anvil extending beyond the pivot opposite to the latch member, the latch member adapted to engage the tongue.

2. In combination, a post, a tong support pivotally mounted to the post and provided with a face for suporting the tong and a second face for engaging the side of the tong, the face in vertical alinement with the center of the pivot, and a latch member adapted to anchor the post and tong support together and adapted to be brought into a latch engagement in alinement With the face of the tong support. 7

3. In a device of the kind" described, a post having a-tongue at its upper end, a pivot extending through said tongue, a tong support mounted on said pivot and having a'tong receiving shouldered portion at its upper end, one face of the shouldered portion being normally vertical and the other,

horizontal to engage the side and bottom 'taces'o't a tong respectively,- a latch hook pivoted to the tong support at the side remote from the shoulder, a should-er on the tongue engageable by the hook latch, and

an anvil formed with the latch and,project-- ing rearwardly away from the tong supportwhereby to'receive a hammer blow torelease the latch and free the tong. I

- In testimony whereof I afiix my signature.

oHAs. W. PERKINS. 

